{"id":211,"date":"2010-09-12T04:01:00","date_gmt":"2010-09-12T04:01:00","guid":{"rendered":"https:\/\/metrix-x.rraz.ca\/?p=211"},"modified":"2026-06-15T01:35:36","modified_gmt":"2026-06-15T01:35:36","slug":"fun-with-bw-film-how-to-do-hdr-from-a-single-scan","status":"publish","type":"post","link":"https:\/\/metrix-x.rraz.ca\/?p=211","title":{"rendered":"Fun With B&W Film – How To Do HDR From A Single Scan"},"content":{"rendered":"

\"Fun<\/a>
\nRight side is a special colour scan of a B&W negative, the middle is a normal scan plus some dodging and burning<\/a>. The right-side is a HDR image<\/a> obtained with the 48bit colour<\/a> left-side image. The right side is scanned in 48 bit colours where the individual RGB<\/a> channels are adjusted for gain, offset and gamma via the histograms<\/a> utilizing the epson software prior to scanning in this case the green channel is normal exposure the red is -1.5 stops under exposed and the blue is +1.5 over exposed. After the scan the RGB channels can be manipulated as a colour image or separated into 3 monochrome channels. You can then  process as a colour image or alternatively as an HDR or with tone mapping<\/a> software. Or as I mostly do you could keep it as a toned image or convert it back to B&W.<\/p>\n

This being 30 years old Kodak Plus-X it does not have nearly the dynamic range<\/a> of that of most fresh films such as tmax would have.<\/p>\n

\n\"Fun<\/a><\/div>\n
\nRGB channels are actually B&W tinted for visualization purposes only<\/p>\n<\/div>\n
\n\"The<\/a><\/div>\n
\nThe Ghost That Walks Beside Us <\/b>is a direct manipulation of a 3 channel B&W scan<\/p>\n\n\n\n\n
<\/a><\/td>\n<\/tr>\n
Casa Loma Stables – The gold tones are because of the scan RGB gains of (1.5,0,-1.5) The reverse of the blue tint above.<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Right side is a special colour scan of a B&W negative, the middle is a normal scan plus some dodging and burning. The right-side is a HDR image obtained with the 48bit colour left-side image. The right side is scanned in 48 bit colours where the individual RGB channels are adjusted for gain, offset and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50,2,51],"tags":[],"class_list":["post-211","post","type-post","status-publish","format-standard","hentry","category-high-dynamic-range-imaging","category-photo","category-tone-mapping"],"_links":{"self":[{"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/posts\/211","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=211"}],"version-history":[{"count":1,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/posts\/211\/revisions"}],"predecessor-version":[{"id":212,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=\/wp\/v2\/posts\/211\/revisions\/212"}],"wp:attachment":[{"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/metrix-x.rraz.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}